# -*- coding: utf-8 -*-
"""
@author: Hekang Xu (E-mail:1092181938@qq.com)
"""
import string, os, sys
import numpy as np
import matplotlib.pyplot as plt
import scipy.io
import random
import tensorflow as tf
import pandas as pd

dir_name = 'data'
print('----------- no sub dir')
print('The folder path: ', dir_name)
files = os.listdir(dir_name)
for f in files:
    print(dir_name + os.sep + f)

file_path = dir_name + os.sep + files[0]
print(file_path)
data = pd.read_csv(file_path, dtype='a')
label = np.array(data['emotion'])
img_data = np.array(data['pixels'])
N_sample = label.size
print(N_sample)
# print label.size
Face_data = np.zeros((N_sample, 48 * 48))
Face_label = np.zeros((N_sample, 7), dtype=int)
temp = np.zeros((7), dtype=int)
for i in range(N_sample):
    x = img_data[i]
    x = np.fromstring(x, dtype=float, sep=' ')
    x_max = x.max()
    x = x / (x_max + 0.0001)

    Face_data[i] = x
    Face_label[i, int(label[i])] = 1
    if i < 10:
        print('i: %d \t ' % (i), Face_label[i])

train_num = 30000
test_num = 5000
train_x = Face_data[0:train_num, :]
train_y = Face_label[0:train_num, :]
test_x = Face_data[train_num: train_num + test_num, :]
test_y = Face_label[train_num: train_num + test_num, :]
print("All is well")
batch_size = 50
train_batch_num = train_num / batch_size
test_batch_num = test_num / batch_size
train_epoch = 100
learning_rate = 0.001
# Network Parameters
n_input = 2304  # data input (img shape: 48*48)
n_classes = 7  # total classes
dropout = 0.5  # Dropout, probability to keep units
# tf Graph input
x = tf.placeholder(tf.float32, [None, n_input])
y = tf.placeholder(tf.float32, [None, n_classes])
keep_prob = tf.placeholder(tf.float32)  # dropout (keep probability)


# Create some wrappers for simplicity
def conv2d(x, W, b, strides=1):
    # Conv2D wrapper, with bias and relu activation
    x = tf.nn.conv2d(x, W, strides=[1, strides, strides, 1], padding='SAME')
    x = tf.nn.bias_add(x, b)
    return tf.nn.relu(x)


def maxpool2d(x, k=2):
    # MaxPool2D wrapper
    return tf.nn.max_pool(x, ksize=[1, k, k, 1], strides=[1, k, k, 1],
                          padding='VALID')


# Create model
def conv_net(x, weights, biases, dropout):
    # Reshape input picture
    x = tf.reshape(x, shape=[-1, 48, 48, 1])
    # Convolution Layer
    conv1 = conv2d(x, weights['wc1'], biases['bc1'])
    # Max Pooling (down-sampling)
    conv1 = maxpool2d(conv1, k=2)
    # Convolution Layer
    conv2 = conv2d(conv1, weights['wc2'], biases['bc2'])
    # Max Pooling (down-sampling)
    conv2 = maxpool2d(conv2, k=2)
    # Convolution Layer
    conv3 = conv2d(conv2, weights['wc3'], biases['bc3'])
    # Max Pooling (down-sampling)
    conv3 = maxpool2d(conv3, k=2)
    # Fully connected layer
    # Reshape conv2 output to fit fully connected layer input
    fc1 = tf.reshape(conv3, [-1, weights['wd1'].get_shape().as_list()[0]])
    fc1 = tf.add(tf.matmul(fc1, weights['wd1']), biases['bd1'])
    fc1 = tf.nn.relu(fc1)
    # Apply Dropout
    fc1 = tf.nn.dropout(fc1, dropout)
    # Output, class prediction
    out = tf.add(tf.matmul(fc1, weights['out']), biases['out'])
    return out


# Store layers weight & bias
weights = {
    # 3x3 conv, 1 input, 128 outputs
    'wc1': tf.Variable(tf.random_normal([3, 3, 1, 128])),
    # 3x3 conv, 128 inputs, 64 outputs
    'wc2': tf.Variable(tf.random_normal([3, 3, 128, 64])),
    # 3x3 conv, 64 inputs, 32 outputs
    'wc3': tf.Variable(tf.random_normal([3, 3, 64, 32])),
    # fully connected,
    'wd1': tf.Variable(tf.random_normal([6 * 6 * 32, 200])),
    # 1024 inputs, 10 outputs (class prediction)
    'out': tf.Variable(tf.random_normal([200, n_classes]))
}

biases = {
    'bc1': tf.Variable(tf.random_normal([128])),
    'bc2': tf.Variable(tf.random_normal([64])),
    'bc3': tf.Variable(tf.random_normal([32])),
    'bd1': tf.Variable(tf.random_normal([200])),
    'out': tf.Variable(tf.random_normal([n_classes]))
}
# Construct model
pred = conv_net(x, weights, biases, keep_prob)
# Define loss and optimizer
cost = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits=pred, labels=y))
optimizer = tf.train.AdamOptimizer(learning_rate=learning_rate).minimize(cost)
# Evaluate model
correct_pred = tf.equal(tf.argmax(pred, 1), tf.argmax(y, 1))
accuracy = tf.reduce_mean(tf.cast(correct_pred, tf.float32))
# Initializing the variables
init = tf.initialize_all_variables()
Train_ind = np.arange(train_num)
Test_ind = np.arange(test_num)
with tf.Session() as sess:
    sess.run(init)
    for epoch in range(0, train_epoch):
        Total_test_loss = 0
        Total_test_acc = 0
        for train_batch in range(0, int(train_batch_num)):
            sample_ind = Train_ind[train_batch * batch_size:(train_batch + 1) * batch_size]
            batch_x = train_x[sample_ind, :]
            batch_y = train_y[sample_ind, :]
            # Run optimization op (backprop)
            sess.run(optimizer, feed_dict={x: batch_x, y: batch_y,
                                           keep_prob: dropout})
            if train_batch % batch_size == 0:
                # Calculate loss and accuracy
                loss, acc = sess.run([cost, accuracy], feed_dict={x: batch_x,
                                                                  y: batch_y,
                                                                  keep_prob: 1.})
                print("Epoch: " + str(epoch + 1) + ", Batch: " + str(train_batch) + ", Loss= " + \
                      "{:.3f}".format(loss) + ", Training Accuracy= " + \
                      "{:.3f}".format(acc))
        # Calculate test loss and test accuracy
        for test_batch in range(0, int(test_batch_num)):
            sample_ind = Test_ind[test_batch * batch_size:(test_batch + 1) * batch_size]
            batch_x = test_x[sample_ind, :]
            batch_y = test_y[sample_ind, :]
            test_loss, test_acc = sess.run([cost, accuracy], feed_dict={x: batch_x,
                                                                        y: batch_y,
                                                                        keep_prob: 1.})
            Total_test_lost = Total_test_loss + test_loss
            Total_test_acc = Total_test_acc + test_acc

        Total_test_acc = Total_test_acc / test_batch_num
        Total_test_loss = Total_test_lost / test_batch_num
        print("Epoch: " + str(epoch + 1) + ", Test Loss= " + \
              "{:.3f}".format(Total_test_loss) + ", Test Accuracy= " + \
              "{:.3f}".format(Total_test_acc))
plt.subplot(2, 1, 1)
plt.ylabel('Test loss')
plt.plot(Total_test_loss, 'r')
plt.subplot(2, 1, 2)
plt.ylabel('Test Accuracy')
plt.plot(Total_test_acc, 'r')

print("All is well")
plt.show()
